For your convenience indicator tips are available with Wheel Analytics. You don’t need to buy indicators to buy indicator tips.
Many were tested before coming up with this kit. Mitutoyo tips are the gold standard and these are just as good. Possibly better if you appreciate the large-diameter knurled locknut on the lateral probe.
Note: Islandix tips are for indicators with M2.5 threads, which is the standard for indicators in most of the world outside America. Indicators offered in the Islandix online shop are all M2.5-threaded.